381486816 has 36 divisors (see below), whose sum is σ = 1084853952. Its totient is φ = 127162176.

The previous prime is 381486799. The next prime is 381486821. The reversal of 381486816 is 618684183.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662016 + ... + 662591.

It is an arithmetic number, because the mean of its divisors is an integer number (30134832).

Almost surely, 2^381486816 is an apocalyptic number.

381486816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

381486816 is an abundant number, since it is smaller than the sum of its proper divisors (703367136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381486816 is a wasteful number, since it uses less digits than its factorization.

381486816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324623 (or 1324612 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 381486816 is about 19531.6874847003. The cubic root of 381486816 is about 725.2590852068.

The spelling of 381486816 in words is "three hundred eighty-one million, four hundred eighty-six thousand, eight hundred sixteen".